نتایج جستجو برای: partial volume effect
تعداد نتایج: 2103220 فیلتر نتایج به سال:
در ابتدا به طور مختصر ارتباط بین مسائل تغییراتی و معادلات دیفرانسیل را بیان می کنیم. همان طور که می دانیم هر معادله دیفرانسیل را می توان به صورت egin{equation} label{yek} a(u)= 0 end{equation} نوشت، که در آن $ a(u) $ یک عملگر دیفرانسیل معمولی یا جزئی خطی یا غیرخطی و $ u $ مجهول می باشد. برای حل این معادلات و به خصوص معادلات دیفرانسیل جزیی غیرخطی راه حل مشخصی وجود ندارد.حساب تغییر...
We report 2 patients with transient abnormalities on magnetic resonance imaging (MRI) associated with partial status epilepticus (SE). A man with a 4-month history of partial seizures had complex partial SE for 9 days, with left temporal maximum on ictal EEG. Left temporal lobe T2 signal was increased on MRI during SE, but cerebral MRI was normal 9 weeks later. A woman with "cryptogenic" tempor...
Investments in the capital market have a high level of risk but also provide profits, so it is very important to know changes macroeconomic variables and investor behavior. In this study will examine effect money supply, inflation volume, transactions on Consumer Goods Index.The partial test results show that supply transaction volume significant positive consumer goods index, has no index.Simu...
The effect of selectivity of beta-adrenoceptor antagonists on resting and post-exercise airway calibre in normal subjects was studied. Eight normal subjects were given atenolol 50 mg, propranolol 80 mg and placebo orally, in random order, double-blind. Specific airways conductance and flow-volume curves (partial and complete) were recorded before, 2 hours after drug administration and after exe...
AIMS AND METHODS To determine whether volume loading may be beneficial for the performance of ischaemic heart, myocardial ischaemia was created by partial occlusion of the left anterior descending coronary artery (LAD) to reduce the blood flow to 30 approximately 40% of basal level in 11 open chest anaesthetised dogs. Global left ventricular function as well as regional performance were studied...
Previous studies have investigated the possibilities of modelling the change in volume and change in density of biomaterials. This can be modelled at the constitutive or the kinematic level. This work introduces a consistent formulation at the kinematic and constitutive level for growth processes. Most biomaterials consist of many constituents and can be approximated as being incompressible. Th...
background: it is well known that there is a close relationship between elevated androgen plasma levels and the ultrasound findings of stromal hypertrophy in polycystic ovary syndrome (pcos). the objective of this study was to investigate the effects metformin on the hyperandrogenism and ovarian volume in pcos. methods: the study is an unrandomized clinical trial with before–after design. twent...
Introduction Diffusion weighted imaging (DWI) allows the determination of the apparent diffusion coefficient (ADC). Since several tissue compartments may be present in a voxel, e.g. tissue and cerebrospinal fluid [1] or tissue and blood [2], the measured ADC is an averaged value, weighted by these partial volumes. To reduce this partial volume effect, several investigators tried to null the mag...
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